The Grafana web ui can be accessed using the web browser on port 3000; for example, http://127.0.0.1:3000. As the server has just started, give it five minutes to see the metrics flowing through the stack, and finally to Grafana. This even includes an alert about the number of nodes down, where no notification channel is set up for this Docker image.
The following screenshot shows an overview of the custom Cassandra Grafana dashboard, part one:
The following screenshot demonstrates an overview of the custom Cassandra Grafana dashboard, part two: